Meniere's Disease Support Group
Meniere's disease is a balance disorder of the inner ear. The symptoms of Meniere's are variable; not all sufferers experience the same symptoms. However, "classic Meniere's" is considered to comprise the following four symptoms: Periodic episodes of rotary vertigo, hearing loss, tinnitus, and a sensation of fullness or pressure in one or both ears.
I did my own tests and discovered that my bad ear hears things at two or three notes higher than my good ear, which makes singing very difficult. It also makes conversations sound like the radio dialogue from the Star Wars Episode 4 Death Star battle (garbled), so even if I can tell somebody is talking, phone conversations are no longer possible with that ear.
Needless to say, this rules out most kinds of hearing aids for me. The ones I tried just make the Death Star conversations louder and the music more incoherent.
Not sure if this is the same experience for you, but I figured I'd put it out there.